Reply To: Change back the previous color

I got it from the online, rgba(229,229,229,255) or #e5e5e5

How should I insert one of this into the custom css?

Is it like this?

div.quantity input[type=”number”] {
color: #e5e5e5;
border-top: 1px solid gray;
border-bottom: 1px solid gray;
}